The following profile describes concentrations of several chemical species with depth in a lake sediment.

a. describe how the redox ‘front’ (aerobic/anaerobic interface) moves in time, as the weather (wet vs. dry) and seasons (cold vs. warm) change.

b. explain what microbial processes would produce these profiles. provide specific reactions

Although china’s total economic output, measured by gross domestic product (gdp), is third largest in the world, it is considered a developing nation. what is most likely the most important factor for this designation? a. china’s government spends money on things that do not benefit human development. b. china has a large population, so its gdp per person is only modest. c. china has a strong economy but weak literacy and school attendance rates. d. china’s high rates of disease offset the country's economic gains.